Means for reclaiming suspended solids from white water of paper manufacture



May 22, 11928.

v A. BANKUs Er AL MEANS FOR RECLAIMING SUSPENDED SOLIDS FROM.

2 Sheets-Sheet 1 Filed Nov. 24, 1925 &

WHITE WATER OF PAPER MANUFAGTURE May 22. 192s; v

' A. BANKUS El' AL MEANS FOR RECLAIMING SUSPENDED SOLIDS FROM WHITE WATER OF PAPER MANUFACTURE 24, 1925 2 Sheets-Sheet 2 Invenof-J ,4M er anka: Geerye JI 50c-.Irvs

Filed Nov.

Parental May 22, 192s.`

`-iiiurnn STATES PATENT oFFici:.-

ALBERT BANKUS, OF PORTLAND, OREGON, AND GEORGE S. BACKUS, 0F SAN FRANCISCO, CALIFORNIA.

MEANS FOR RECLAIMING SSPENDED SOLIDS FROM WHITE WATER OF PAPER HANUFACTURE. 4

Application ala november 24, 192s. serial mi. 71,234.'

Our invention relates to the recess of papermaking in which so-calle machinefurnish-that is, a mixture of paper making materials suitable to produce the particular kind of paper desiredis fed to the paper making machine and produces the' paper sheet and so-called white-water.

It is well known that said white-water suspended in it a considerable quantity-of short fibres and other solids, which collecti'vely have an appreciable value, and the waste of which constitutes an appreclablc loss in the process of mechanical paper inakthe short fiber and other solids from the ass ' making plants white water by a practical method and means thru. a medium which will return the solids recovered from the white-water, without contaminationl to the machine furnish from which the whitewater-is produced.

In short, in order to reclaim, in an eiicient manner, the short fibres and other solids suspended in the white-water, it has been .found expedient to make, or cause the formation of, a filter mat, or filter aid, from some of the long vfiloered material used for paper making, and to filter the white-water through such mat; but as we have discovered, if such long fibered material be suppliedfrom any other source than theparticular materials of whichthemachine-furnish for lthe work in hand is made u detrimental variations in the character of t e paper produc-ed will result. For example, inpaper manufacturing different kinds of paper, several kinds of paper stock are produced. Now if paper stock other than -the actual machine-furnish of a givenv ,paper machine be used as a filter-aid for reclaiming the said solids of the white-water coming from that machine, a contaminatin' ingredient may be introduced -into the stoc so used, which would be detrimental thereto, and tend to render such stock unfit as a general source of supply of the machine-furnish for the manufacture of other kinds of Papel" We havediscovered that s uch contamination ma be avoided by using as the said 1`he object of this invention is to reclaim pi'ovement of the method previously used for reclaiming the short fibers and other suspended solids, of the white-water resulting from the process of mechanical paper making by using for the filter aidpart of the same macliine-i'urnisl1- as that` from which the wliite-water is obtained, and then returning, directly or indirectly, as conven-l ient or desirable, to the machine-furnish in the regulating box of the paper making machine, the material taken off the filter.

A further object of our invention is to ef' feet the reclaiming of the suspended solidsy vof the white-water without interfering with the operation of the paper making machine or disturbing the nice adjustments of the various controls for the stuft'.

The details of our method and the means which we found convenient for carrying the saineinto practice are hereinafter described with reference to the accompanying draw" 76 ings, in which:

liigml is a diagrammatic elevation of a portion of a paper making machine with its various supply and control devices arranged in accordance with our preference; Fig. 2 is a section taken longitudinally through a certain mechanical :filter element which We-ind expedient to use; and Fig.` 3 \is a larger scaled diagrammatic fragmentary View of said mechanical filter element serving to illustrate the'manner in` which the long fibers of a part of the materials making up the machine-furnish tend to felt with each other to form a filter medium over the screen-like surface of said filter element.

The means comprised in our mechanical combination are especially adapted for recovering tlie said solids of the White-Water coming from a Fourdrinier type of paper making machine which we have chosen for convenience as illustrating the carrying of our invention into practice.

Referring to Fig. 1, the arrow a points to a miniature diagrammatic representation of' the wire part of a Fourdrinier machine of which a designates the `wire on which the paper ysheet is formed. The excess water raining through said wire, and constituting the so-called white-water, is collected in a vat a.-

A. drain pipe b is provided in the bottom of said vat a, said pipe discharging into the aisn - white-water in the other end of the vat, be-

transverse partition a? so that the whitewater at that end of the vat to which the pipe b is connected is separate from the cause the fiber content of the first mentioned end of the vat is usually much greater thanI that at the other end.

Another drain pipe f extends through the bottom of said vat a substantial distance on the same side of said partition aa as that to which the pi eb is connected. By locating the mouth o said pipe f a substantial distance above 'the bottom of the vat a2 an ample supply of white-water is assured the pipe b.

A branch pipe f taps the other end of said vat a2, connects with the pipe f and both pipes connect with the pipe f2 in which a pump g is located which forces said white- \"Water to a filter or save all h.

The machine-furnish is 'delivered from a general supply,such as the beaters, through an `inlet i into the machinechest i and is kept in agitated condition in the latter; and it is continuouslypumped out from the bottom of the machine chest by the pump j through a pipe cinto a regulating box Z. From this'box a portion of the machine-r furnish is directed to` the Jordan through a pipe d and the excess portion is returned to the machine chest through a pipe c.

ipe m carriesI a portion ofthe machinefurnish from the regulating box Z and the pipe .f2 the white-water to a mixing pipe n in which said two materials tend to intermix and from there are introduced into the vat la of the filter h. Automatic control valves are preferably provided at 0 and o 1n said pipes f2' and m, respectively, by which to regulate the uantitles of whitewater and machine-furnish delivered to said i filter L. 4

The yparticular filter shown in detail in Fig. 2 merely illustrates a type which we find convenient to use. This type is known as the Oliver continuous filter described in U. S. Patent No. 919,628 issued to Edwin L. Oliver April 27th, 1909. Said filter comprises avat h in which is rotatably `mounted a cylinder h2 provided with a plurality of contiguous suction boxes la* which make up its circumference, the suction boxes being covered with a screen-like draining surface It". Said vsuction boxes are connected to a hollow chamber 1f, provided at the hub or center of said cylinder h2, by radial tubes if; and said hollow chamber h 'is connected toa `vacuum receiver p by a pipe p', as shown in A vacuum pump g maintains re- Fig. 1. duced pressure in said vacuum receiver p and thus the liquid drawn into said suction boxes It* from the space h3 between the e linder h2 and the vat l1. is removedfrom tlie vacuum receiver p through a pipe r. Means, not shown, are preferably provided by which compressed air is introduced into that one of said suction boxes h* which has reached a predetermined position so that the mat formed on the draining surface of such suction box will be blown 0H and run down the chute s and the material so removed may be diluted by a shower of white-water, as indicated at t in Fig. 2, to a desired consistency before it is returned into the machine chest i; said diluting being effected by a branch pipe f3 connected to the pipe f2, as shown in Fig. 1.

As illustrated diagrammatically in Fig. 3, the long fibers in the machine-furnish introduced into the vat L of the filter k tend to felt and form a filter mat on they draining surface of the cylinder h2 and ,in that way provide a filter medium or mat for catching short fibers or other solids suspended in the white-water. At first the filter mat formed on the draining'surface of the cylinder It is relatively thin, but as the cylinder rotates the mat will increase in thickness because the short fibers of the White-water will combine with the long fibers of the machinefurnish. Hence our invention provides a convenient and efiicient method and means by which the fiber content and other suspended solids of the white-water are reclaimed by the use of a part of the machinefurnish' of the same paper making machine as the filter medium and the reclaimed solids are kept free from contamination likely to.

be introduced by the use of a material as a filter aid taken from an outside source.

For the convenience of the person using our invention, we have indicated, approximately, on Fig. 1 the values of the stock or solids relatively to the liquid of the material carried from one part of the machine to another in the different stages of our process.

While describing our method' specifically as used in connection with a Fourdrinier machine, it is, of course, a plicable to other types of paper making mac ines.

e claim: v l

1: In a paper making machine, in combination with a container of the machine-furnish, a vat for the white-water drained ofi' the machine-furnish, and a filter for said White-Water,-means for delivering part of the 'machine-furnish from said container to said filter, continuously; and means for returningto the machine-furnish the material taken :from said filter.

atlvely to each other,

2. In a'paper making machine, in combination with a container of the machine-furnish, a vat for the white-water drained of the machine furnish, and a filter for said -white-water,-means for delivering part of the machine-furnish from said container and of the .White-water to said filter, continuously; and means for returning to the machine-furnish the-material taken from said filter.

3. In a paper making machine, in comblna'tion with a container ofthe machine-fur nish, a vat forl the white water drained' ofi the machine furnish, and a filter for said white-waterf-means for delivering part of the machine-furnish from said container and of the white-water to said filter,continuous ly 5 means for automatically controllin relthe quantities o said white-water and the machine-furnish delivered to said filter; and means for returning to the machine-furnish container the material takenl from said filter.

e 4.'In a aper making machine, in combi. nationv wit 'a contaln'er of the machine-furnish,

a vat for the white-water drained of! the machine furnish, and a filter for said f White\vater,-means for delivering part of the machine-furnish from vsaid container and the white-water to said filter, continuously; a machine chest into which the material taken for said filter empties;l an agitator in said machine chest; andmeans for returning the material in the machine chest to said machine-furnish. l

5. In a paper making machine, in combination with a container of the machine-furnish, a vat for the white-water drained of the machine furnish, and a filter for said white-watenmeans forl delivering part of the machine-furnish from said container and of the 'white-water to said filter, continuously; means for automatically controlling relatively to each other, the uantities of said white-water and the ,mac ine-furnish delivered to said filter; `a machine chest into which the material taken for said filter emnties; an agitator in said machine chest; an means for returning the material in the machine chest to said machine-furnish. g

- 6. In a paper making machine, in combination, a regulating-box for machine-furnish; a vat for the white-water; stockprocessing devices; means for delivering art of the machine-furnish from said reguating'box and a part o f the white-water from said vat to said stock-processing de-v means for returning the material in the machine chest to said regulating box.

7. In a aper making machine, in combination wit a container of the machine-furnish, a vat for the white-water drained o6 the machine-furnish, and a filter for said white-water,-means for delivering part of ,the machine-furnish from said container to said filter, and means for returning to the machine-furnish the material taken from said filter. i

- ALBERT BANKUS.

GEO. S. BACKUS. 

